What ever oil u use as long as it says JASO-MA on the back side rating it is wet clutch compatable. Car oil works for some but have seen clutch trouble with it. Dealer told my son just to use car oil and he called me with little or no clutch. I use Rotella 15x40 and is wet clutch compatable. I changed his to that when we got the bike home. Never a problem since. To each his own doesn't matter to me but I like my clutch.
not true about an oil having to have a JASO-MA rating.
http://www.valkyrieforum.com/bbs/index.php/topic,65911.0.htmlhttp://www.lngpublishing.com/LNGmagazine/index.cfmthis months issue
http://viewer.zmags.com/publication/e9f4b3fd#/e9f4b3fd/1see article Two-wheelers love oil too!
they have a pic of the new goldwing valkyrie as a bonus.
JASO spec'd motorcycle oil are basically the same specs as heavy-duty diesel oil standards.
JASO does not test oils, manufactures pay a fee to JASO and state their oil meets the specs.
see article, another grade for the heavy-duty upgrade?
even better diesel oils coming into the market much better wear protection and using a 10w30 for better mpg.
use technical facts not emotional logic and one will save money on oil and fuel costs.
I have posted my used oil analysis before using Amsoil 10w30 diesel oil for 8k miles from the hot summer through a cold winter riding with the bike sitting for 1 month, one of the toughest conditions for an oil. UOA came back normal to low wear and oil was still good for continued use, for at least another 2k miles, even after the oil was in the bike for over 2 yrs.
for one example there have been posts by others who run rotella 5w40 for 10 k miles and have over 100k miles on the bike.